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ISL97671 Datasheet PDF : 28 Pages
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ISL97671
Electrical Specifications
All specifications below are tested at TA = 25°C; VIN = 12V, EN = 5V, RSET = 20.1kΩ, unless
otherwise noted. Boldface limits apply over the operating temperature range, -40°C
to +85°C. (Continued)
PARAMETER
DESCRIPTION
CONDITION
MIN
MAX
(Note 8) TYP (Note 8) UNIT
tENLow
BOOST
EN Low Time Before Shut-down
30.5
ms
SWILimit Boost FET Current Limit
1.5
2.0
2.7
A
rDS(ON)
SS
Internal Boost Switch ON-resistance
Soft-Start
TA = +25°C
100% LED Duty Cycle
235
300
mΩ
7
ms
Eff_peak Peak Efficiency
ΔIOUT/ΔVIN
DMAX
Line Regulation
Boost Maximum Duty Cycle
VIN = 12V, 72 LEDs, 20mA
92.9
%
each, L = 10µH with DCR
101mΩ, TA = +25°C
VIN = 12V, 60 LEDs, 20mA
90.8
%
each, L = 10µH with DCR
101mΩ, TA = +25°C
0.1
%
FSW = 1, 600kHz
90
%
FSW = 0, 1.2MHz
81
DMIN
Boost Minimum Duty Cycle
FSW = 1, 600kHz
FSW = 0, 1.2MHz
9.5
%
17
fOSC_hi
fOSC_lo
ILX_leakage
Lx Frequency High
Lx Frequency Low
LX Leakage Current
FSW = 1, 600kHz
FSW = 0, 1.2MHz
LX = 45V, EN = 0V
475
0.97
600
1.14
640
1.31
10
kHz
MHz
µA
REFERENCE
FAULT DETECTION
VSC
Short Circuit Threshold Accuracy
Reg0x08, SC[1:0] = 01
Reg0x08, SC[1:0] = 10
3.15 3.6
4.3
V
4.2
4.8
5.4
V
Reg0x08, SC[1:0]= 11
5.2 5.85
6.6
V
Temp_shtdw Temperature Shutdown Threshold
n
150
°C
Temp_Hyst Temperature Shutdown Hysteresis
23
°C
VOVPlo
Overvoltage Limit on OVP Pin
OVPfault OVP Short Detection Fault Level
CURRENT SOURCES
1.19
1.25
V
400
mV
IMATCH
DC Channel-to-Channel Current Matching
IACC
Vheadroom
VRSET
ILEDmax
Current Accuracy
Dominant Channel Current Source
Headroom at CH Pin
Voltage at RSET Pin
Maximum LED Current per Channel
PWM GENERATOR
RSET = 20.1kΩ,
Reg0x00 = 0xFF,
(IOUT = 20mA)
ILED = 20mA
TA = +25°C
RSET = 20.1kΩ
VIN = 12V, VOUT = 45V,
Fsw=1.2MHz, TA = +25°C
±0.7 ±1.0
%
-1.5
+1.5
%
500
mV
1.2 1.22 1.24
mV
40
mA
Guaranteed Range for PWM Input Low Voltage
0.8
V
Guaranteed Range for PWM Input High Voltage
1.5
VDD
V
6
FN7631.0
June 24, 2010
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